Typewriting machine



TYPEWRITING MACHINE Filed July 10, 1940 INVENTOR7 .afirmm gm ATTORNEY W.A. GABRIELSON Aug. 19, 1941.

Patented Aug. 19, 1941 TYPEWBITING MACHINE William A. Gabrielson,Syracuse, N. Y., minor to L. C. Smith & Corona Typewrite rs, Inc.,

Syracuse, N. Y., a corporation of New York Application July 10, 1940,Serial No. 344,767

7 Claims.

The invention relates to improvements in typewriting machines and moreparticularly to paper feed bail mechanism associated withthe rollerplaten of such a machine to hold the work sheet or sheets to the platenabove the printing line.

The invention provides an improved form of paper holding and feedingbail and an improved mounting therefor upon the platen carria e of themachine, and also provides a paper bail device of the overhead" bailtype which is highly efficient in operation and may be convenientlymanipulated in using the machine. The construction is also such that itmay be produced at low cost and the bail may be readily and quicklyattached to and disassembled from the platen carriage.

To the foregoing and other ends which will hereinafter appear from thefollowing description of the preferred embodiment of the inventionillustrated in the accompanying drawing, the invention consists in thefeatures of construction, arrangement of parts, and combinations ofparts and devices particularly pointed out in the appended claims.

In the drawing:

Fig. 1 is a fragmentary top planview of the improved machine with thebail in its "on or normal working position;

Fig, 2 is a fragmentary vertical longitudinal sectional view of themachine on the line 2-2 of Fi 1;

Fig. 3 is a detail sectional view on an enlarged scale and taken on theline 3-4 of Fig. 1;

Fig. 4 is a detail sectional view similar to Fig. 3, but showing thebail in fully cast-oil position;

Fig. 5 is a detail sectional view on an enlarged scale and taken on theline 5-! of Fig. 3;

Fig. 6 is a detail view similar to Fig. 3 illus-. trating a method ofdetaching the ball from its mounting on the carriage; and

Fig. '7 is a detail perspective view showing one of the two similarpivot ends of the hail, the one shown being the one at the right handend of the carriage,

The improvements are shown embodied in a known typewriting machine, theL. C, Smith typewriting machine, and only so much of the known machineas is necessary, for a clear understanding of the present invention hasbeen shown in the drawing and will be described.

The usual mail frame It of the machine has the usual platen carriage llmounted thereon to travel back and forth transversely of the machine,and the usual roller platen structure is rotatively journalled in theends of the carriage for travel therewith and for revolution of theplaten roller to feed the paper, said structure including the usualrotative roller platen l2 and the usual finger wheels I! for rotatingthe platen. The usual pawl and ratchet line spacing mechanism fcrrotating the platen roller is also provided, the ratchet wheel of saidmechanism being shown at M. 'Rigidly held to the carriage ad- Jacentopposite ends thereof by screws ii are the two usual upwardly andrearwardly extending end brackets l8 located in rear of the rollerplaten structure. Each metal bracket It has rigidly secured thereto atits outer edge as usual a rigid metal and plate l1, said plates.disposed vertically edgewise in vertical parallel planes extendingfore-and-aft of the machine. The improvements will now be described.

The detachable paper bail consists of a pair of rigid fore-and-aftextending metal side arms la, a front rigid metal cross rod i9 rigidlyand permanently fixed at its ends to the front ends of the side arms, apair of combined pivot and anchorage members 20 each formed of a'singlepiece of metal and fixedly and permanently held to the rear ends of therespective side arms and extending inwardly therefrom transversely ofthe machine, and preferably also includes a pair of paper feed rolls 2|journalled on the cross rod IQ of the ball. The said bail is a rigidunitary structure which is detachable as a unit from the carriage ashereinafter described.

Each combined pivot and anchorage member 20 of the bail consists of acylindrical metal stud cut away or flattened at one side at the bottomof said. groove to a diametrical line of the stud or stub shaftproviding a flat diametrical wall or face 23 at the bottom of the groovethe ends of which are joined by a semi-cylindrical bottom face or wall24 of the groove, said flat wall or face 23 extending preferably acrossthe member 20 as shown substantially longitudinally of the side arm ofthe bail,

The combined pivot and anchorage studs or stub shafts 20 of the bail arejournalled removably in open bearing slots or notches 25 formed in therespective plates I1 above the brackets 16 and above and in rear of theroller platen structure l2-l3. Each slot or notch 25 is open at itsupper end and preferably extends upward and rearward as shown, being aswide as the maximum diameter of stud and rounded or curved at its lowerclosed end to conform with the contour of the major body portion of stud20.

The thickness of each plate I"! conforms substantially with the distancebetween the inner face of the adjacent bail side arm I 6 and the outeredge of the groove 22 of the stud 26 engaged in notch 26 of said plate,and each said ball side arm is enlarged at its rear end opposite theattached stud as shown at I! to abut the outer face of the adjacentplate I! in all rocked positions-of the bail. Parts ll are coactive withthe plates I I to assist in holding the bail in assembled workingrelation with the carriage and platen against axial movement of the ail.

To further hold the bail against axial movement and to releasably holdit pivotally engaged in the open-top bearing slots or notches 2!, aswell as for other purposes hereinafter explained, two stiff wire springs26 are provided which extend upwardly and rearwardiy at the inner facesof the respective plates i1. Between its ends.

. near its lower end, each spring is coiled about the shank of a screw21 tapped in the adjacent plate II. The lower arm of each spring 26bears constantly against the front face of the adjacent bracket l6, andthe upper arm of each spring is resiliently heldby the spring tension toextend at least partly, and preferably entirely, across the adjacentslot at the inner face of the adjacent plate I! with said upper armengaged in groove 22 of the adjacent stud 26 of the bail. At its upperend each spring 26 is preferably bent to form an eye or closed loop 26for engagement by a suitable hook to resiliently bend the upper portionor arm of the spring forward to permit the trunnions to be passedthrough the slot mouths for attachment and detachment of the bail. Saidsprings 26' constantly. hold the trunnions down to the bottoms of slots25.

When the ball is assembled on the carriage with rolls 2| in contact withthe platen roller i 2, the flat faces 23 of studs 20 face upward andpreferably also slightly forwardly, as shown in Figs. 2 and 3, with thesprings 26 pressing resiliently down on the front ends of said flatfaces 23 to yieldingly hold the rolls 2| to the platen or to paperpassed about the platen. Upon a predetermined extent of upward andrearward swinging of the ball away from the platen, the springs 26 willno longer press on flat faces 23 but will press on the semi-cylindricalfaces 24 of studs 20 and thereafter said springs will serve tofrictionally hold the bail cast-oil. from the platen in variouspositions up to its maximum cast-off position. The maximum cast-offposition of the bail is determined by engagement of the bail side armswith suitable stop means such as lugs 26 on plates II.

Throughout most of the throw of the bail from its position of Fig. 4 tothat of Figs. 1, 2 and 3 the springs bear on faces 24 and willfrictionally hold the ball at any point. Throughout the remainder of thethrow of. the bail from its position of Fig. 4 to that of Figs. 1, 2 and3 the springs press on the flat faces 23 and resiliently force the bailtoward the platen. Preferably the parts are so shaped and arranged thatthe springs 26 engage only the front ends of flat faces 23, as shown,when the studs 20 are seated in notches 25.

What I claim is:

1. In a typing machine having a platen carriage, a roller platenjournalled on the carriage, and a paper-holding bail coactive with theplaten, means detachably pivotally holding the bail to the carriage forswinging of the bail toward and from the platen, said means comprising,in combination, a pair of journal members fixedly held to the respectiveside arms of the bail and detachable from the carriage with said bail, apair of bearing supports on the carriage adjacent opposite ends of thecarriage each formed with an open bearing slot for one of said journalmembers, a pair of springs anchored to the respective bearing supports,each spring and the adjacent bail side arm abutting opposite faces ofthe adjacent bearing support, each journal member having acircumferential channel in which the adjacent spring is releasablyengaged, each spring having a free end portion normally extendingacrossthe mouth of the adjacent bearing slot and flexible to permit thejournal member to be moved into and out of the slot.

2. In a typing machine having a platen carriage, a roller platenjournalled on the carriage, and a paper-holding bail coactive with theplaten, means detachably pivotally holding the bail to the carriage forswinging of the bail toward and from the platen, said means comprising,in

combination, a pair of journal members fixedlyheld to the respectiveside-arms of the bail and detachable from the carriage with said ball, apair of bearing supports on the carriage adjacent opposite ends of thecarriage each formed with an open bearing slot for one of said journalmembers, a pair of springs anchored to the respective bearing supports,each spring and the adjacent bail side arm abutting opposite faces ofthe adjacent bearing support, each journal member having acircumferential channel in which the adjacent spring is releasablyengaged, each spring having a free end portion normally extending acrossthe mouth of the adjacent hearing slot and flexible to permit thejournal member to be moved into and out of the slot, and the channel ineach journal member having a bottom wall flattened transversely of theJournal member at one point therearound for engagement of the adjacentspring with said flattened wall portion while the ball is swung to orclose to the platen. I

3. A typewriting machine having, in combination a roller platen, apaper-holding bail swingable to and from the platen, a platen carriagein which said platen is journalled having a pair of bail supportingmembers provided with bearing notches for the bail, the side arms ofsaid bail provided with inwardly extending fixed trunnions journalled insaid bearing notches, said side arms each abutting the outer face of adifierent one of said supporting members adjacent the bearing notchtherein, and a pair of spring means each releasably engaged with adifferent one of said trunnions at the inner face of the adjacentsupporting member to releasably hold the trunnion in its bearing notchand to assist the said supporting member in holding the bail againstaxial movement.

4. A typewriting machine as claimed in claim 3, wherein the carriage isprovided with stops limiting movement of the ball away from the platen,each trunnion has a curved surface concentric with its axis and has aflat surface extending transversely of its axis, which surfaces areengageable by the adjacent spring means as the bail approaches said stopmeans and said platen respectively, and each spring means is a wirespring having a trunnion engaging arm the free end of which is formedwith an eye or loop to facilitate flexure of said arm to free theadjacent trunnion, each said trunnion having an annular shoulder betweenwhich and the ad- Jacent supporting member said spring arm normallyextends.

5. In a typing machine having a platen carriage, a roller platenjoumalled on the carriage, and a paper-holding bail coactive with theplaten, means detachably pivotally holding the bail to the carriage forswinging of the bail toward and from the platen, said means comprising,in combination, a pair of journal members fixedly held to the respectiveside arms of the bail and detachable from the carriage with said ball, apair of bearing supports on the carriage adjacent opposite ends of thecarriage each formed with an open bearing slot for one of said journalmembers, a pair of springs anchored to the respective bearing supports,each spring bail side arms abutting opposite Y faces of the adjacentbearing support, means to lock the bail and the ioumals to the bearingsupports to hold the bail against lateral shifting when in paperfeedingposition, each spring releasably engaging the. adjacent journal and eachspring having a free end portion normally extending across the mouth ofthe adjacent bearing slot and flexible to permit the journal member tobe moved into and out of the slot.

6. A typewriting machine having, in combination, a roller platen, aplaten carriage in which said platen is Journalled, apaper-holding bail-co-active with the platen and having side arms provided at their rearends with journals extending inwardly longitudinally of the carriage,each bail journal being formed with an annular groove the bottom wall ofsaid groove comprising a curved surface concentric with the axis ofthejournal and a flat surface connecting the ends of said curved surface,said carriage having a vertically arranged upwardly extending bearingplate at each side thereof the rear portions of the side arms of thesaid bail engaging the outer faces of said plates, each plate beingformed at its upper edge with upwardly opening bearin slotsin which saidinwardly extending journals are removably engaged. spring means inpressing and the adj acent engagement with the said journals, saidspring means comprising a spring for each journal, each spring anchoredto the carriage on the inner side ofone of said bearing plates andhaving an upwardly extending arm engaging the inner face of said bearingplate and extending over the top of one of the loumals and engaged inthe groove thereof and pressing on the said curved and fiat surfaces ofthe journal successively during rocking of the bail toward and from theplaten, the

journals being held between the springsand the closed lower ends of thebearing slots, said arms of the springs being flexible to release thejournals for withdrawal through the open ends of the slots, whereby thesprings will lock the Journals to the bearing plates against axialmovement and will prevent accidental withdrawal of the journals fromthe. bearing slots, in all positions of the bail.

7. A typewriting machine, in combination, a roller platen, a platencarriage in which said platen is journalled, a paper-holding bail formedas a complete rigidly connected unit and comprising side arms providedat their rear ends with rigid journals extending inwardly longitudinallyof the carriage and a rod connecting the front ends of said side armsand carrying feed rollers. said carriage having vertically arrangedupwardly extending bearing plates at each side thereof, the rearportionsof the side arms of said ball engaging one of the side, faces of thesaid plates, each plate being formed atits upper edge with upwardlyopening bearing slots in which said journals are removably engaged,springmeans in pressing engagement with said journals, said spring meanscomprising a spring for each journal, each spring anchored to thecarriage and having an upwardly projecting arm extending along onesurface of a bearing plate on the opposite side thereof from theadjacentside arm and projecting over the top of one of the Journals and pressingon the said journal during the rocking of the bail toward and from theplaten, the journals being held between the springs and the closed lowerends of the bearing slots, said arms of the springs being flexible torelease the journals for withdrawal through the open ends of the bearingslots and the remov of the paper ball as a complete unit.

a; aannmtson.

